JPH062972B2 - Weft processing method for shuttleless loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a method for treating a weft yarn woven into a woven fabric in a shuttleless loom such as a jet loom, a rapier loom, or a gripper loom, immediately before the stop of the loom. It is about.

(Prior art) It is possible to expect much higher productivity for shuttleless looms such as jet looms compared to shuttleless looms, and the trend of adopting shuttleless looms has been remarkable in recent years, but weft insertion error rate It is a well-known fact that it is higher than that of a shuttlecock loom. When a weft insertion error occurs, the machine is stopped based on the weft insertion error detection signal from the weft detector, but in high-speed weaving machines such as a shuttleless loom, one machine revolution or more is taken into consideration to prevent damage to each part. Since the machine base is stopped after the inertial operation, a weft thread that has been miss-inserted (hereinafter referred to as a miss thread) is beaten and woven into a woven fabric immediately before the machine base is stopped.

Japanese Patent Laid-Open Nos. Sho 58-220856 and Sho 59-21757 disclose a weft yarn treating apparatus for removing the above-mentioned miss yarn, which becomes a woven mark of the woven cloth, from the woven cloth.

In Japanese Patent Laid-Open No. 58-220856, a weft processing device having one finger for separating the miss yarn woven in the woven fabric from the woven fabric is located at a retracted position on a guide rail laid in the weft width direction. To the predetermined miss yarn processing position, slide on the woven fabric to allow the fingers to enter the warp yarn opening while rubbing the cloth fell from the outside of the warp yarn opening, and put the miss yarn from the woven fabric into the warp yarn opening. It is designed to separate into.
The miss yarn thus separated is scraped off from the outside of the warp yarn and delivered to the miss yarn pulling-out means inserted into the warp yarn opening, and is moved and arranged between the warp yarns and between the warp yarns to the outside of the warp yarn opening. A part of the miss yarn is pulled out from the warp yarn opening to the outside of the warp yarn opening together with the miss yarn drawing device.
A part of the miss yarns drawn out of the warp yarn opening is pressed and held between the pair of pulling rollers, and by driving both pulling rollers, all the miss yarns are pulled out from the warp yarn opening. The miss yarn pulled out in this way is sucked and removed by the suction means.

On the other hand, in Japanese Unexamined Patent Publication No. 59-21757, a weft cutting device that prevents weft insertion during machine frame inertial operation, introduces and holds a weft insertion blocking weft between a pair of pressure contact rollers, and operates each weft insertion A method is disclosed in which the cutting function is temporarily stopped to maintain the connection between the miss yarn and the following weft yarn without cutting, and the press roller is rotated to pull out the miss yarn from the inside of the weft yarn opening and to suck and remove the miss yarn. ing.

(Problems to be Solved by the Invention) In the conventional device as disclosed in Japanese Patent Application Laid-Open No. 58-220856, the first requirement is that the finger catches the miss yarn that has been struck in the weaving cloth to catch the miss yarn from the weaving cloth. Is to be surely separated. As it tries to hook the miss thread by adopting a configuration that makes the finger to have an almost elliptical orbit,
In order to separate one miss yarn from the cloth fell, very delicate movement of the fingers is required. However, even if the maximum open state of the warp is formed, the state in which the miss yarn is grasped by the warp is not sufficiently released. Therefore, the intermediate part of the finger pivotally connected to the tip of the swingable arm around the point is unidirectional. It is difficult to surely avoid a situation in which the miss thread is unsuccessfully hooked, although the substantially elliptical orbit is obscured by the complicated configuration of circular movement. If the miss yarn separation fails, the miss yarn will be woven into the woven fabric, leading to deterioration of the woven fabric quality.

Even when the miss yarn is successfully separated from the cloth fell by the fingers, the gripping action by the warp yarn is still applied to the part other than the separation part by the finger. A corresponding pull-out resistance occurs. Therefore, there is a possibility that the miss yarn is cut due to the pull-out resistance during the pulling out of the miss yarn. This also leads to the incorporation of miss yarns into the woven fabric, resulting in deterioration of the quality of the woven fabric.

In the conventional device disclosed in Japanese Patent Laid-Open No. 59-220856, there is a similar possibility that the yarn may be cut during the drawing due to the drawing resistance.

That is, reliability, efficiency, etc. have not been sufficiently achieved in the miss yarn automatic processing using the conventional weft processing device.

Configuration of the Invention (Means for Solving the Problems) Therefore, in the present invention, the weft yarn woven into the woven fabric is released before the machine stand is stopped by forming the warp yarn open state, and in this state, The weft is pulled out from the warp opening through the weft withdrawing path, and the weft is held between a pair of sliding rotors that are arranged so as to be able to come into contact with and separate from the weft, and the weft is rotated by the weft pulling device pulling out the weft. The rotation amount of the contact rotating body is detected, and when the detected rotation amount is within a preset rotation amount range, it is determined that the weft drawing process is successful, and the detected rotation amount falls within the set range. If there is no weft, it is determined that the weft drawing process has failed.

(Operation) That is, the pair of contact rotating bodies in the separated state are joined by sandwiching the weft yarn based on the weft insertion error detection signal, and the weft pulling device is operated so that the weft yarn in the warp shed is warped. It is pulled out from within the opening. Along with the pulling out of the weft, the pair of contact rotating bodies that press and hold the same weft rotate in a follow-up manner, and the rotation amount of the contact rotating body is detected by the rotation amount detecting means. When the weft is normally pulled out from the warp shed, the detected rotation amount falls within a preset range, whereby it is determined that the weft pull-out process is successful, and the machine base restart is selected. .

If a weft cut occurs during weft pulling out,
The detected rotation amount deviates from the set range, whereby it is determined that the weft drawing process has failed, and the machine restart is stopped.
Responses such as warnings are made.

(Example) An example in which the present invention is embodied in a jet loom will be described below with reference to Figs.

As shown in FIG. 1, reference numeral 1 denotes a weft insertion main nozzle mounted on one end side of a sled 2 which is reciprocally swung, and on a drum 4 which forms a yarn winding surface of a weft measuring and storing device 3. The weft yarn Y, which is supplied from the yarn winding tube 5 and wound and measured and stored, is guided into the weft inserting main nozzle 1 and is inserted into the weft guide passage 6a of the deformed reed 6 standing on the sley 2. Injection weft insertion is carried out in synchronization with the weft insertion timing from the main nozzle 1. The fluid supply to the weft inserting main nozzle 1 is controlled by opening / closing the electromagnetic valve 1A, and the opening / closing of the valve 1A is performed in synchronization with the machine base.

A rotary support shaft 7 for supporting the drum 4 rotatably relative to the bobbin 5 is held stationary, and the weft Y introduced into the coaxial 7 from a weft cheese (not shown) is guided to the bobbin 5. ing. The weft yarn is pulled out from the drum 4 by the shaft 8
It is controlled by the intersection and separation of the weft thread locking body 10 fixed to the tip of the cam lever 9 which is swingably supported on the bobbin winding surface of the drum 4, and the swing of the cam lever 9 is synchronized with the machine base. It is performed by the rotation of the cam 12 on the drive shaft 11 which is driven to rotate and the action of the pressing spring 13. The rotation of the drive shaft 11 is transmitted to the rotation support shaft 7 via the timing pulley 14, the timing belt 15, and the timing pulley 16 fixed to the rotation support shaft 7, and is integrated with the coaxial shaft 7 to form the bobbin winding tube 5.
By revolving around the drum 4, the weft yarn Y is supplied from the yarn winding tube 5 onto the drum 4.

An air cylinder 17 is arranged near the lower part of the cam lever 9, and a drive rod 17 a thereof is arranged toward the cam lever 9. In the projecting state of the drive rod 17a, the tip of the rod 17a abuts and presses against the cam lever 9, so that the weft thread catching body 10 can be held in a state of intersecting the thread winding surface. That is, the weft insertion blocking device 1 is constructed by the weft measuring and storing device 3 and the air cylinder 17.
8 are configured. The operation of the air cylinder 17 is controlled by opening and closing the electromagnetic valve 19, and the valve 19 is always closed.

When the weft yarn Y ejected from the weft inserting main nozzle 1 is properly wefted and reaches the end portion of the woven fabric W on the side opposite to the main nozzle, the weft yarn is beaten by the deformed reed 6 and woven. W is woven. Then, the woven cloth W is cut by the weft cutting device 20 provided near the weft inserting main nozzle 1 side, and the subsequent weaving operation is continued.

When a weft insertion error such that the weft does not reach the end portion on the side opposite to the main nozzle, the feeler F arranged corresponding to the end portion detects the weft insertion error and the weft insertion error detection from the feeler F is detected. The operation of the machine base drive motor M is stopped based on the signal.

After the weft insertion error detection signal (which is also a machine standstill signal) is issued, the machine stand rotates by inertia about once and then stops.
That is, when a weft insertion error occurs, a weft insertion error detection signal is issued while the sley 2 is advanced from the last retracted position shown by the solid line in FIG.
After beating on the woven fabric W, the sley 2 further reciprocates and stops immediately before the beating position shown by the chain line in FIG. As shown in FIG. 3, the weft cutting device 20 comprises a fixed blade 22 and a movable blade 23 mounted on a fixed shaft 21, and a cam lever 2 which is swung by a cam 24 which is rotated in synchronization with the machine base.
5 and the movable blade 23 are operatively connected via a link 26, and a weft cutting operation is performed every time weft insertion. Cam lever 2
An electromagnetic solenoid 27 is provided in the vicinity of 5, and its drive rod 27a abuts on the cam lever 25, so that the weft cutting device 20 can be maintained in the open / open state. The electromagnetic solenoid 27 is operated based on the weft insertion error detection signal to prevent the weft cutting device 20 from cutting the miss yarn Y '.

A weft inserting / drawing device 28 is arranged near the last retracted position of the weft inserting main nozzle 1, and the weft Y1 following the miss yarn Y ′ is cut from the weft inserting main nozzle 1 during the machine inertia operation. It is designed to be sucked and removed.
Explaining the weft drawing device 28, a blocking body 30 is provided at the tip of a drive shaft 29a of a motor 29 capable of forward and reverse rotations, and is shown by a solid line separated from the same position as the weft breaking position shown by a chain line in FIG. It can reciprocate between itself and the retracted position. A cutting body 31 is provided below the blocking body 30.
Is fastened.

Suction device 32 operated based on the weft insertion error detection signal
A suction pipe 33 connected to the cutting body 3 is disposed in the vicinity of the blocking body 30, and the cutting body 3 is provided on the front side of the pipe 33.
A cutting board 34 for receiving 0 is provided. The second suction pipe 35 separated from the base end of the suction pipe 33.
Are arranged in succession and are connected to the suction device 32. A motor 36 is provided below the suction pipes 33, 35.
The drive roller 37 fixed to the drive shaft of the motor 36 is disposed between the suction pipes 33, 35 and close to the suction pipe 35 side. Further, between the suction pipes 33, 35, a length-measuring roller 38 is rotatably arranged close to the suction pipe 33 side.
An arm 39 is fixed to the upper end of the roller shaft 38a in an orthogonal state, and a magnetic body 39a is fixed to the upper surface of the tip of the arm 39. A magnetic displacement detection sensor G is arranged immediately above the rotation locus of the magnetic body 39a.

An air cylinder 40 is provided laterally between the suction pipes 33, 35.
Is provided. Drive rod 40a of the cylinder 40
A support plate 41 is slidably supported by the pressure plate 42 and is biased by a pressure spring 42 in the protruding direction of the drive rod 40a. The driven roller 4 is provided on one side of the front surface of the support plate 41.
3 is rotatably supported so as to face the drive roller 37, and can be joined to the drive roller 37 by the projection of the drive rod 40a of the air cylinder 40. A support shaft 44 is slidably supported on the other side of the support plate 41, and is pressed and biased by a pressing spring 45 in the protruding direction of the drive rod 40a of the air cylinder 40. Support shaft 44
A length-measuring roller 46 is rotatably supported at the tip end of the air-conditioning roller 38 so as to face the length-measuring roller 38, and can be joined to the length-measuring roller 38 by the projection of the drive rod 40a of the air cylinder 40. . The motor 36 and the air cylinder 40 are operated based on the weft insertion error detection signal from the feeler F.

The operation of the electromagnetic valve 1A, the weft insertion preventing device 18, the weft cutting device 20, the weft drawing device 28, and the machine frame driving motor M described above is controlled based on a command from the control device C shown in FIG. The control device C issues the command based on signals from the feeler F, the machine base rotation angle detection device S, and the magnetic displacement detection sensor G. Control device C
Comprises an input / output interface, a CPU (central processing unit), and a storage unit for storing the miss yarn processing program shown in the flowchart of FIG.

In the present embodiment, the miss yarn processing when the weft insertion error occurs is executed based on the miss yarn processing program shown in the flowchart of FIG. Therefore, the operation of the miss yarn processing when a weft insertion error occurs will be described below.

When a weft insertion error occurs, the miss yarn Y'is set to the cloth W of the cloth W.
1, the feeler F issues a weft insertion error detection signal, and the controller C issues an operation stop command to the machine drive motor M based on the signal. At the same time, the electromagnetic solenoid 2 of the weft cutting device 20
An operation command is sent from the control device C to the air cylinder 17 of the weft insertion prevention device 7 and the weft insertion device 7. The cutting function of the weft cutting device 20 is canceled by the operation of the electromagnetic solenoid 26, and the miss yarn Y'is kept connected to the weft inserting main nozzle 1 side without being cut. Further, the operation of the air cylinder 17 keeps the weft-locking body 10 in a state intersecting with the thread winding surface on the drum 4, and is ejected from the weft-inserting main nozzle 1 following the miss yarn Y'during the machine frame inertia operation. The weft insertion of the weft Y1 is prevented. After the weft insertion error detection signal is transmitted, the machine frame makes one full revolution due to inertia, and the machine frame stops just before the sley 2 reaches the position shown by the chain line in FIG. After the machine base is stopped, the reverse rotation operation command is sent from the control device C to the machine drive motor M, the machine base is stopped at the last retracted position, and the maximum open state of the warp is formed.

After the machine base is reversed, the controller C sends a normal rotation command to the motor 29, and the operation of the air cylinder 17 is released.
The suction device 32 is operated and the electromagnetic valve 1A is opened for a predetermined time. As a result, the weft yarn Y1 on the drum 4 becomes the third
The weft-inserting main nozzle 1 ejects toward the blocking body 30 which is rotatably arranged at the chain line position in the figure, and the same weft Y1 is received by the blocking body 30 and sucked into the suction pipe 33. After stopping the fluid injection from the weft insertion main nozzle 1,
The reverse rotation of the motor 29 causes the breaker 30 to return to the retracted position shown by the solid line in FIG.
Is struck on the cutting board 34, and the weft Y1 is cut and separated from the main nozzle 1 for weft insertion.

The tip portion of the weft Y1 sucked by the suction pipe 33 is subsequently sucked and introduced to the suction pipe 35 side. After that, the air cylinder 40 is operated to drive the drive roller 3 as shown in FIG.
7, the driven roller 43, and the length measuring roller 38 and the length measuring roller 46 are pressed against each other with the weft Y1 interposed therebetween. Roller pair 37,
After 43 and the length measuring roller pair 38, 46 press and hold the weft yarn Y1, the motor 36 is operated and the miss yarn Y'is started to be pulled out by the pulling action of the roller pair 37, 43.
Along with the transition of the weft Y1, the pair of length measuring rollers 38 and 46 that press and hold the same weft Y1 rotate following it. Measuring roller 3
The rotation of 8 causes the magnetic body 39a to trace the rotation trajectory around the roller shaft 38a, and a pulse signal is input to the control device C every time the magnetic body 39a and the magnetic displacement detection sensor G come close to each other, and the number of pulse signals is controlled. Counted in device C. When all the miss yarns Y'are pulled out from the warp opening without causing a cutting accident, the ends of the miss yarns Y'pass through the length measuring roller pairs 38 and 46. When the end of the miss yarn Y'passes the length measuring roller pair 38, 46, the length measuring roller pair 3
Although the rotation of Nos. 8 and 46 is stopped, the rotation amount of the length measuring roller 38 is grasped by the control device C as the count number n of the pulse signal. As the length of the miss yarn Y ′, the length measuring roller pair 38,
A range [n1, n2] (n1 <N <n2) including the pulse signal number N corresponding to the length of the miss yarn Y ′ is set in advance from the joining position of 46 to the end of the miss yarn Y ′. Are stored in the control device C. The count number n of the pulse signal is included in the range [n1, n2], and the control device C determines that the miss yarn Y'is successfully drawn out based on the confirmation result. Then, based on this confirmation result, the machine base is automatically reversed to the position most suitable for restart, and the machine base is automatically restarted from the reverse position.

If a cutting accident occurs during the pulling out of the miss yarn Y ', the rotation of the length measuring roller pair 38, 46 is stopped when the cut end of the miss yarn Y'passes the length measuring roller pair 38, 46.
The controller C grasps the rotation amount of the length measuring roller pair 38 as the pulse signal number m. The count number m deviates from the range [n1, n2], and the control device C determines that the drawing of the miss yarn Y'has failed based on the confirmation result. Then, a blinking warning of the abnormality display lamp 47 shown in FIG. 5 is issued in response to a command from the control device C, and the subsequent missed yarn drawing process, machine base reverse rotation and restart are manually transferred.

In this way, when the missed yarn drawing process is unsuccessful, the cause of the non-woven fabric, that is, the missed yarn left in the warp yarn opening is surely removed, and the machine base is restarted while leaving the missed yarn Y'in the warp yarn opening. The situation is certainly avoided.
Therefore, the quality deterioration of the woven fabric W due to the weaving of the miss yarn Y'is prevented, and the reliability of the miss yarn processing is significantly improved. Most of the causes of the weft insertion error are bending or loop formation at the weft end portion, and the length of the miss yarn Y'injected from the weft insertion main nozzle 1 into the warp opening is normal in most cases. It is the same as the length of one weft insertion. Therefore, the check result of the miss yarn drawing process for most of the weft insertion errors reflects the actual process result, and the failure of the actual miss yarn drawing process is surely reflected in the check result of the miss yarn drawing process.

In the present embodiment, even if slipping of the miss yarn occurs in the pull-out roller pair 37, 43 due to pull-out resistance, this slip phenomenon does not affect the length measuring action in the length measuring roller pair 38, 46. , The length of the miss yarn is measured accurately. In a method other than the length measuring method as in the present embodiment, for example, a method of measuring the amount of rotation of the drawing roller itself from the start to the end of drawing by a pair of drawing rollers or a method of measuring the drawing time, the slip phenomenon causes an error in measuring the yarn drawing amount. I shall. Moreover, there are two sensors for measuring the amount of rotation of the pull-out roller itself, namely, a sensor for confirming the passage of the wrong yarn end pull-out roller pair and a sensor for measuring the pull-out roller rotation amount. Only the rotation amount measurement sensor of is required, and the measurement control is easy.

The present invention is of course not limited to the above-mentioned embodiments, and the embodiments shown in FIGS. 7 and 8 are also possible.

In the embodiment shown in FIG. 7, pull-out roller pairs 48 and 49 are installed upstream of the length-measuring roller pairs 38 and 46, and take-up roller pairs 50 and 50 are provided downstream of the length-measuring roller pairs 38 and 46.
51 is installed and the pull-out roller pair 48, 49 side is operated earlier than the pull-out roller pair 50, 51 side. Due to change in pull-out resistance due to some cause, the length measuring roller pair 38, 46 and the miss yarn Y ' There is no influence on the length measuring action such as slippage between and, and the pull-out length measuring is more accurate as compared with the above embodiment.

In the embodiment shown in FIG. 8, a belt 54 is elastically stretched between a pair of rollers 52 and 53, and the belt 54 and the length measuring roller 55
The weft thread is held between and by the pressure contact, and the contact resistance to the weft thread increases to effectively prevent the slip phenomenon during length measurement.

Further, the embodiment shown in FIG. 9 is also possible in the present invention. In this embodiment, the claw piece 57 of the weft processing device 56 installed above the cloth fell rubs the cloth from the outside of the warp opening and enters the inside of the warp opening to hook the miss yarn, and subsequently moves to the outside of the warp opening. Then, a part of the missed yarn is pulled out and a part of the missed yarn pulled out is moved to the pressing contact between the pulling-out roller pairs 58 and 59. (One roller is biased by a spring like the other roller pairs) also holds the miss yarn under pressure. Then, the amount of rotation of the length-measuring roller is measured, and the weft processing similar to that in each of the embodiments is selectively performed.

Furthermore, the present invention can be applied to a case where the weft insertion process is performed immediately before the machine stand is stopped in order to prevent the weft in the machine stand stop other than the occurrence of a weft insertion error.

Effects of the Invention As described in detail above, according to the weft processing confirmation method of the present invention, a situation in which unnecessary wefts are not left in the warp shed is reliably avoided, and unnecessary wefts to the woven fabric are reduced. Weaving is prevented.

[Brief description of drawings]

1 to 6 show an embodiment embodying the present invention.
The figure is a schematic plan view of the vicinity of the sled, FIG. 2 is a front view of the weft insertion blocking device, FIG. 3 is a side view of the weft drawing device and the weft cutting device, and FIG. FIG. 5 is a plan view, FIG. 5 is a block diagram, FIG. 6 is a flow chart showing a miss yarn processing program, FIGS. 7 and 8 are plan views of main parts of another example of the present invention, and FIG. 9 is another example. It is a partially broken front view shown. Length measuring rollers 38 and 46 as a pair of contact rotary bodies, a magnetic displacement detection sensor G as a rotation amount detecting means, and a miss yarn Y '.

Claims (1)

[Claims] 1. A warp yarn opening state is formed to release the weaving of the weft yarn woven into the woven fabric immediately before the machine stand is stopped, and in this state, the weft yarn withdrawing path is drawn out from the inside of the warp yarn to the outside of the warp yarn opening. The weft is sandwiched by pressure between a pair of contact rotors that are arranged so as to be able to come close to and separate from each other, and the amount of rotation of the contact rotor that rotates with the pulling out of the sandwiched weft is detected, If the detected rotation amount is within the preset rotation amount range, it is determined that the weft drawing process is successful, and if the detected rotation amount is not within the set range, the weft drawing process is failed. Weft processing method for loom.